#include "stm32f10x.h"                  // Device header
#include "Pins.h"
void PWM_Init(void)
	{
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
		GPIO_InitTypeDef GPIO_InitStructure;
		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
		GPIO_InitStructure.GPIO_Pin = PWMB | PWMA | PWM_SERVO;
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
		GPIO_Init(GPIOA,&GPIO_InitStructure);//配置GPIO
		
		RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
		TIM_InternalClockConfig(TIM2);
		//选择内部时钟打开
		
		TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
		TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
		TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
		TIM_TimeBaseInitStructure.TIM_Period = 20000-1;   //ARR
		TIM_TimeBaseInitStructure.TIM_Prescaler = 72-1;//PSC
		TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
		TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure);//配置时基单元
	  
		TIM_OCInitTypeDef TIM_OCInitStructure;
		TIM_OCStructInit(&TIM_OCInitStructure);
		TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
		TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
		TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
		TIM_OCInitStructure.TIM_Pulse = 0;  //CCR
		TIM_OC3Init(TIM2,&TIM_OCInitStructure);
		TIM_OC2Init(TIM2,&TIM_OCInitStructure);
		TIM_OC1Init(TIM2,&TIM_OCInitStructure);
		TIM_Cmd(TIM2,ENABLE);//使能定时器
	}
	
	void PWM_SetPWM1(uint16_t Compare)
		{
			TIM_SetCompare2(TIM2,Compare);
		}
		
void PWM_SetPWM2(uint16_t Compare)
		{
			
			TIM_SetCompare3(TIM2,Compare);
		}	
		
void PWM_SetPWM3(uint16_t Compare)
		{
			TIM_SetCompare1(TIM2,Compare);
		}		
		